JS基础教程：2023.4.2坚持第35天-JavaScript web APIs BOM操作

前言

记录时间：2023.4.2

已坚持学习第35天

JavaScript从入门到精通

学习javascript时间历程记录打卡

晚上9：00到23：00

JS-BOM操作总结

完成代码练习

1.bom操作

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // document.querySelector()
    // window.document.querySelector()
    console.log(document === window.document)
    function fn() {
      console.log(11)
    }
    window.fn()
    var num = 10
    console.log(window.num)
  </script>
</body>

</html>

2.延迟函数

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    setTimeout(function () {
      console.log('时间到了')
    }, 2000)
  </script>
</body>

</html>

4. 03-5秒自动关闭的广告

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    img {
      position: fixed;
      left: 0;
      bottom: 0;
    }
  </style>
</head>

<body>
  <img src="./images/ad.png" >
  <script>
    // 1.获取元素
    const img = document.querySelector('img')
    setTimeout(function () {
      img.style.display = 'none'
    }, 3000)
  </script>
</body>

</html>

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